SCHEDULE II – CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 56	$ 64	$ 58
Charged to Costs and Expenses	0	34	55
Charged to Other Accounts	0	0	0
Deductions	13	42	49
Balance at End of Period	$ 43	$ 56	$ 64